Bring Your Own Big Wheel is an annual Easter Day ride down San Francisco’s Lombard Street, the crookedest street in the world. On tricycles, Big Wheels, or other childhood conveyances. There’s only one rule: No rubber wheels.

Plastic wheels + brick pavers = entertainment! Riders do their best Fred Flintstone to regulate their speed as they twist their way down the hill.

From the San Francisco Chronicle race coverage:

“This race may seem ridiculous, but it transcends ridiculousness,” said veteran competitor Luke Powell. “This is about something else.”